Ok.. one of my clients running CM 4.2 is having problems logging in at their site and getting Error 
I have read the documentation in "Troubleshooting Extension Mobility" which says...
Solution: On this page, right-click on the form.jsp, then select Save Link As or Save Target As. Select the location to download the form. Ensure that the first line of the form.jsp page reads: <%@ page import="java.net.InetAddress" %>
....call me a half wit but... what do I do with this file once downloaded? The other problem is that I have no remote access to the clients call manager or server so I am going to have to talk him through what to do with this file... I am assuming it goes into a directory somewhere??